PuTTY TELNET Trust Sigil Vulnerability

A vulnerability exists in PuTTY versions 0.77 prior to 0.84, where the application incorrectly maintains a trust indication for TELNET data after proxy authentication. This flaw could mislead users into believing a request from a malicious server was legitimate, potentially exposing sensitive information such as proxy passwords.

Impact

Exploitation of this vulnerability could lead to unintentional disclosure of proxy passwords to a TELNET server or a man-in-the-middle attacker.